It's not the tone of the post. It's that you're pushing your own book, complete with its cover image at the very top and its title entered in the thread tags, in the wrong venue.
Also you copy-pasted from the Nookboards forum, where the original seems to have gotten deleted. I'm afraid that sort of thing does kind of make it look like a multi-site spam attempt.
We do have a
self-promo forum for authors now. Best of luck with it!